less

Page through text one screenful at a time, Search through output, Edit
the command line. less provides more emulation plus extensive enhancements such as allowing backward paging through a file as well as forward movement.

Syntax
less [options]
<command> | less [options]

Moving Commands:

Commands marked with * can be preceded by a number, N.
Notes in parentheses indicate the behavior if N is given.

Each "find close bracket" command goes forward to the close bracket
matching the (N-th) open bracket in the top line.
Each "find open bracket" command goes backward to the open bracket
matching the (N-th) close bracket in the bottom line.

mletter Mark the current position with .
'letter Go to a previously marked position.
'' Go to the previous position.
^X^X Same as '.

A mark is any upper-case or lower-case letter.
Certain marks are predefined:^ means beginning of the file$ means end of the file

Changing files:

:e [file] Examine a new file.
^X^V Same as :e.
:n * Examine the (N-th) next file from the command line.
:p * Examine the (N-th) previous file from the command line.
:x * Examine the first (or N-th) file from the command line.
:d Delete the current file from the command line list.
= ^G :f Print current file name.

Miscellaneous Commands:

-flag Toggle a command line option [see OPTIONS below].
--name Toggle a command line option, by name.
_flag Display the setting of a command line option.
__name Display the setting of an option, by name.
+cmd Execute the less cmd each time a new file is examined.
!command Execute the shell command with $SHELL.
|Xcommand Pipe file between current pos & mark X to shell command.
v Edit the current file with $VISUAL or $EDITOR.
V Print version number of "less".

OPTIONS:

Most options can be changed either on the command line,
or from within less by using the - or -- command.
Options can be given in one of two forms: either a single character preceded by a -, or a name preceeded by --.

When the output of less is redirected to a file, it behaves like cat, no additional output is added or input requested.

“Counter to the widely held belief that industrial agriculture is more efficient and productive, small farms produce far more per acre than large farms” ~ Christos Vasilikiotis (University of California, Berkeley)

Related:

The less home pageecho - Display message on screenhead - Output the first part of file(s)more - Display output one screen at a time
pg - Display one page at a timetail - Output the last part of filestee - Redirect output to multiple files
Equivalent Windows command:
MORE - Display output one screen at a time.